Brush device



Nov. 8, 1960 c. T. M. MANBERG 2,958,390

BRUSH DEVICE Filed Jan. 16, 1957 9144 914-3 .9 ifi-J 9144 9 l I I l\\States Patent 2,958,890 Patented Novo-8,

2,958,896 BRUSH DEVICE CharlesT. M. Manbel'g,v Huskvarna,.Swedemassgnorto Aktiebolaget Husqvarna Burstfabrik, Huskvama, Sweden, a joint-stockcompany` of Sweden Filed Jan. 16, 1957, ser. No. 634,529 l Claimspriority, application Sweden Jan. 19, 1955 s claims. (c1. 1s-'199') Theinvention relates to brush strips and brushes comprising a plurality ofbrush strips of the type having a layer of bristles bent around a wire.v

A brush strip of this type is described in my co-periding appl'cationSerial No. 586,527, `tiled* May 22, 19,56, now Patent No. 2,903,727'according t'o which the layer of bristles is folded around the wire andsewnl together.

,An object of the invention is to have the two folded portions separatedfrom 'eachother and to obtain amore straight form of the bristles.

Another object ofv the invention is to reduce the fric't'on between thebase portions of the bristles and prevent burning. v

A further object of therpinvention isito provide lseparating layersbetween the folded portions of the bristles in a simple manner andw'thout essentially increasing the width of the base portion of thebrush strip.

A still further object of the invention is to provide a brush stripwhich is flexible and can be bent into any desired form.

St'll another object of the invention is to provide a brush strip whichrequires no holder embracing the wire and the bristles.

Other objects and advantages of this invention will be apparent from thefollowing description and the accompanying drawing, wherein:

Fg. 1 is a cross sectional view of a brush strip according to one formof the invention;

Fig. 2 is a side elevation of the brush strip shown in Fig. l;

Fig. 3 is a top View of a strip of material; and

Fig. 4 is a partial cross sectional view of one form of a brushcomprising a plurality of brush Strips according to Fig. 1.

The core of the brush strip consists of a wire 5 of metal, plastic orany other suitable material, 'and around this wire are folded twoconnected strips 1, 2 of a materfal, such as paper, cardboard, fabric orthe like and preferably of an elastic material, such as a crape paper,or of another material, such as cardboard. According to Fig. 3 thestrips 1, 2 of the same width are formed from a single strip of thickpaper, in which rectangular central portions are punched to form bridges3 separated from one `another by intermediate openings 9, the extent ofthe individual bridges in the longitudinal direction of the brush stripbeing considerably less than the extent in the same direct'on of theindividual openings. The strips 1, 2 are folded together around the wirewithout gluing so as to be located entirely above the wire 5, and theyhave preferably together substantially the same thickness as the widthor diameter of the wire. In order to make them somewhat flexible intheir own plan their outer edges are cut through at short intervals asshown at 4. A layer of brstles 7 of any desired material is thereafterfolded over the wire 5 and the strips 1, 2 and then sewn together by aseam 6 to a unit. The seam preferably passes through the strips 1, 2 butmay also be located above the strips.

The brush strip may be produced in the following wjay. A l'ayer ofparallel bristles are fed from a hopper onto two parallel endless belts.The punched strip 1, 2 is` fed from a roller onto the bristles, andthereafter the wire 5 is fed from another roller onto the strip. Arotating press`ng device folds the bristles and the strip simultaneouslyto the position shown in Fig. 1, and while maintained in this positionthe brush strip passes a sewing machine, whereafter it is wound up on astorage drum from which it may later be drawn olf in connection with themanufacture of brushes.

The bridges serve to keep the two strips 1, 2 in proper position duringthe feeding and folding operation, and as they are rather narrow thebristles are distributed during the feed and folding operation in such away that the width of the base of the brush str'p in spite of thethickness ofy the bridges will be substantially constant and as .smallas without bridges, which is of advantage for obtaining a compact brush.The strips 1, 2 can also form separate strips which are connected bypaper bridges glued thereto, whereby material is saved.

The brush strips may be used for making brushes of d'fferent kinds. Aplurality of straight brush strip-s may be united in a Suitable manner,or a single, flexible brush strip may be wound to a helical or otherform. Between the adjacent brush strips it is preferred to apply a stripof lpaper or cardboard 8 which may be provided with cuts `at one or`both ends'for making the strip flexible in its own plan. Thisy stripmay be glued on both sides and pressed against the brush strips so thata stiff base portion of a brush unit is obtained. lf the strip 8 extendsdown into the space between the Wires the br'stles between the strip 8and the strips 1, 2 will not be pressed too hard together which has beenfound to be of advantage. The bristles are evenly distributed in thetransverse direction of the brush strips, and between all adjacentlayers of substantially radial bristles free spaces are obtained wherebya good vent lation is obtained so that heat which is generated byfriction between the bristles and often causes burning, may be bettercarried olf.

When making cylindrical brushes a brush strip and a strip 8, whichpasses from a roller through a glueing apparatus, can be wound togetherupon a cylindrical core and thereafter be pressed together in axiald'rection, until the glue has settled. The core can then be removed, anda stiff brush unit is obtained which can easily be mounted on arotatable core in a brushing machine.

The brush strip and the strip S can also be wound upon each other in aspiral form for obtaining a flat, a conical or a round brush surface.

I claim:

1. A brush strip, comprising a wire, two strips of material havingtogether substantially the same tota-l thickness as the Wire andextending along and in direct contact with each other and being unitedby a series of bridges, which are bent around the wire and are separatedfrom one another by intermediate openings, the extent of the individualbridges in the longitudinal direction of the brush strip beingconsiderably less than the extent in the same direction of theindividual openings, a layer of free bristles bent around the wire andaround said strfps of material and being sewn together with said Stripsof material for holding the base portions of the bristles so as toextend parallelly from the Wire, `and an intermediate spacing layer ofmaterial prov'ded between adjacent portions of the brush strip and gluedto the bristles for forming a solid brush body.

2. A brush strip, comprising -a wire, two strips of material havingtogether substantially the same total thickness as the wire and extendngalong and in direct contact with each other and being united by a seriesof bridges, which are bent around the Wire and are separated from oneanother by intermediate openings, the extent of the individual bridgesin the longitud'nal direction of the brush strip being considerably lessthan the extent in the same direction of the individual openings, saidbridges and said two strips of materia-l forming a single ribbon with aseries of openings provided between the bridges, a layer of freebristles bent around the wire and around said strips of material andbeing sewn together with said strips of material for holding the baseportions of the bristles so as to extend parallelly from the wire, andan intermediate spacing layer of material provided between adjacentportions of the brush strip and glued to the bristles for forming asolid brush body.

3. A brush strip, comprising a wire, two strips of an easily exiblematerfal having together substantially the same total thickness as theWire and extending along and in direct contact with each other and beingunited by a series of bridges, which are bent around the wire and have awidth considerably less than the width of intermediate openings, saidbridges and said two strips of material forming a single ribbon with -aseries of openings provided between the bridges, a layer of freebristles bent around the wire and around said strips of material andbeing sewn together with said strips of material for holding the baseportions of the bristles so as to extend parallelly from the wire, andyan intermediate spacing layer of material provided between adjacentportions of the brush strip and glued to the bristles for forming asolid brush body.

4. A brush strip as claimed in claim 3, characterized in that the singleribbon is formed of a paper strip having the opposite edges cut throughat short intervals for making ysaid two strips of material more ilexiblein their own planes.

5. A brush strip, comprising a wire, two strips of material havingtogether substantially the same total thickness as the wire andextending along and in direct contact with each other and being unitedby a series of br'dges, which are bent around the wire and are separatedfrom one another by intermediate openings, the extent of the individualbridges in the longitudinal direct'on of the brush strip beingconsiderably'less than the extent in the same direction of theindividual openIngS, said bridges and said two strips of materialforming a single paper ribbon with a series of openings provided betweenthe bridges, a layer of free bristles bent around the wlre and aroundsaid strips of material and being sewn together with said strips ofmaterial for holding the base portions of the bristles so as to extendparallelly from the wire, and an intermediate spacing layer of materialprovided between adjacent portions of the brush strip and extendinginwards through the `space between two-adjacent p-ortions of the wire,and said spacing layer being glued to the bristles for forming a solidbrush body.

References Cited in the tile of this patent UNITED STATES PATENTS1,152,180 Jarvis Aug. 31, 1915 1,183,434 Chapin May 16, 1916 1,663,584Cleaves Mar. 27, 1928 1,769,145 Kranz July 1, 1930 FOREIGN PATENTS27,777 Great Britain 1906

